Are people purposefully acting stupid?
Dr. Disrespect did not technically break the law because he did not have sex with an underaged girl. But if he was texting back and forth with an underaged girl to eventually meet up with her at Twitchcon then it's enough to severe business relationships with him.
There is most likely proof of the text but the parties involved probably don't want to release them because the girl is underaged and doesn't want to eventually be doxxed by weirdos on the internet. Her parents probably also want this to be done behind the scenes as well.
This is now starting to get steam outside of just the gaming community.